chia7712 commented on code in PR #16614:
URL: https://github.com/apache/kafka/pull/16614#discussion_r1685352004


##########
storage/src/main/java/org/apache/kafka/storage/internals/epoch/LeaderEpochFileCache.java:
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@@ -348,7 +348,8 @@ public void truncateFromEndAsyncFlush(long endOffset) {
                 // - We still flush the change in #assign synchronously, 
meaning that it's guaranteed that the checkpoint file always has no missing 
entries.
                 //   * Even when stale epochs are restored from the checkpoint 
file after the unclean shutdown, it will be handled by
                 //     another truncateFromEnd call on log loading procedure, 
so it won't be a problem
-                scheduler.scheduleOnce("leader-epoch-cache-flush-" + 
topicPartition, this::writeToFileForTruncation);
+                List<EpochEntry> entries = new ArrayList<>(epochs.values());
+                scheduler.scheduleOnce("leader-epoch-cache-flush-" + 
topicPartition, () -> checkpoint.writeForTruncation(entries));

Review Comment:
   > They probably should be done in the same PR?
   
   I assumed that it needs more discussion for the changes of production code. 
For example:
   
   > Yeah, could be an issue in some cases (e.g. deleteRecords is called 
frequently, and/or kafka-schedulers are busy) though.
   
   The two follow-ups are orthogonal now, and hence I prefer to fix them 
separately to avoid unnecessary block.
   
   BTW, please feel free to leave more comments on the 
https://issues.apache.org/jira/browse/KAFKA-17167 for the fix.



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